Blog Archives - RS Kiln Refractory Bricks

The energy consumption of cement rotary kiln is very serious, especially when the refractory materials in the transition zone before and after the cement rotary kiln are not protected by the kiln skin, the refractory bricks are directly affected by material erosion, heat load and mechanical stress, and the use conditions are very harsh. At present, the transition zone of large cement rotary kilns generally uses Silicon carbide mullite bricks, silica-molybdenum red bricks or magnesia-alumina spinel bricks, and the service life basically meets the requirements of cement production. However, due to the large thermal conductivity of magnesia-alumina spinel bricks and silica-molybdenum bricks, Silicon carbide mullite red bricks, magnesia-alumina spinel bricks ≥3.0 W/m·K, Silicon carbide mullite bricks ≥2.8 W/m·K. As a result, the outer wall temperature of the cylinder in the transition zone before and after the operation of the cement rotary kiln is too high, averaging about 340℃ and up to 400℃. The higher outer wall temperature of the cylinder brings a series of problems, such as increasing the coal consumption per ton of cement clinker and increasing the emission of polluting gases. Severe cases also cause “red kilns”, affecting the safe operation of cement rotary kilns.

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Low Thermal Conductivity Magnesia-Alumina Spinel Bricks

In order to solve the problem of high thermal conductivity of magnesia-alumina spinel bricks, the sintering performance and microstructure of rare earth oxide-doped porous magnesia-alumina spinel refractory aggregates were studied. Porous magnesia-alumina spinel was prepared with industrial α-alumina micropowder and fused magnesia sand as the main raw materials, sodium dodecylbenzene sulfonate (SDBS) as the foaming agent, and dextrin as the binder. In addition, different mass fractions of Y2O3, Yb2O3, La2O3, and Sm2O3 were added respectively, and the samples were kept warm for 3 hours at 1600℃ for sintering. The bulk density and apparent porosity of the sintered samples were measured respectively, and the phase composition and microstructure were analyzed by XRD, SEM, EDS, and other characterization methods to reveal the mechanism of rare earth oxides promoting the sintering reaction process of porous magnesia-alumina spinel.

The introduction of rare earth oxides promotes the sintering of magnesium-aluminum spinel. The sample volume density and compressive strength reach the maximum when the Sm3O2 addition is 1.5wt%, which are 2.28g/cm³ and 50.5Mpa, respectively. A substitution solid solution is formed between the rare earth oxides and magnesium-aluminum spinel, which promotes the sintering densification of magnesium-aluminum spinel. Cation vacancies and lattice defects of magnesium-aluminum spinel are conducive to the development and growth of magnesium-aluminum spinel crystals. The thermal conductivity of the product made from this raw material is significantly lower than that of similar products.

The lightweighting of refractory materials is mainly achieved by introducing a certain amount of pores into the materials, which has a lower thermal conductivity without significantly reducing the strength of the refractory materials. It can save energy and reduce resource consumption in the preparation and service of raw materials, which is a direction of research and development of refractory materials. Therefore, the development of new low thermal conductivity magnesium-aluminum spinel lightweight refractory materials has important practical significance for energy saving and consumption reduction in the cement industry.

When synthesizing magnesium-aluminum spinel lightweight aggregate, adding yttrium oxide, ytterbium oxide, lanthanum oxide and samarium oxide can increase the volume density of the sample, reduce the apparent porosity, increase the compressive strength, and promote the formation of magnesium-aluminum spinel. Among them, the sample with samarium oxide added has better sintering performance. When the addition amount of Sm2O3 reaches 1.5 wt%, the sample has the lowest apparent porosity and the highest volume density of 2.28g/cm³ and 31.72%, respectively.

Rongsheng Magnesia Aluminum Spinel Bricks for Cement Kilns

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Application of Low Thermal Conductivity Magnesia-Alumina Spinel Bricks

The low thermal conductivity multi-layer composite magnesia-alumina spinel bricks developed by the above technology are used in 24-32 meters, and the average temperature is 43℃ lower than that of magnesia-alumina spinel bricks, and the service life reaches more than 12 months. Low thermal conductivity magnesia-alumina spinel bricks are not only recognized by domestic customers, but also have been used in many rotary kilns by overseas customers such as Mexican cement and Turkey, and have been highly praised.

In response to the high energy consumption and high carbon emissions in the cement industry, the low thermal conductivity multi-layer composite magnesia-alumina spinel bricks studied by Rongsheng Refractory Material Factory have the following advanced features: through the form of a three-layer composite structure, the working layer is optimized, the thermal conductivity of the working layer is reduced, the thermal shock resistance is improved, and the insulation layer is optimized to improve the strength of the insulation layer. Through the study of different insulation materials, zirconia reinforced alumina fiberboard with excellent high temperature resistance is selected as the insulation layer material. In the preparation process, innovative production processes are used to achieve synchronous molding and synchronous firing, simplify the process, reduce costs, and improve production efficiency. The thermal conductivity of low thermal conductivity magnesium-aluminum spinel brick is 2.4-2.5W/(m·K), which is much lower than the 3.0-3.3W/(m·K) of ordinary magnesium-aluminum spinel brick.

According to the actual application feedback from customers, low thermal conductivity multi-layer composite magnesium-aluminum spinel brick can effectively reduce the temperature of the transition zone cylinder of cement kiln, with significant energy saving and carbon reduction benefits. It provides a new direction for energy saving and emission reduction of cement rotary kiln.

Magnesium-Aluminum Spinel Brick for Lime Kiln

Magnesium-aluminum spinel brick for lime kiln is a high-performance refractory material designed for lime kiln. It is mainly composed of magnesium-aluminum spinel (MgAl2O4) generated by the reaction of magnesium and aluminum oxides at high temperature, and may contain a certain amount of other refractory oxides to enhance its performance. Magnesium-aluminum spinel has excellent high temperature resistance, corrosion resistance, thermal shock resistance and other characteristics, making it an ideal choice for key parts in lime kiln (such as burning zone, preheating zone, etc.).

Magnesium-aluminum spinel bricks for lime kilns have the following characteristics:

(1) High temperature resistance: Magnesium-aluminum spinel bricks have extremely high refractoriness and can withstand the high temperature environment in the lime kiln, ensuring the stable operation of the kiln.

(2) Corrosion resistance: In the reducing atmosphere of the lime kiln, magnesium-aluminum spinel bricks can resist the erosion of kiln slag and furnace gas, extending the service life.

(3) Thermal shock resistance: Magnesium-aluminum spinel bricks have good thermal shock resistance and can withstand the thermal stress caused by the rapid change of kiln temperature, preventing the brick body from cracking and falling off.

Magnesium-aluminum spinel bricks are mainly used in key areas such as the firing zone and preheating zone of the lime kiln. These areas have extremely high requirements for the performance of refractory materials. The use of magnesium-aluminum spinel bricks can significantly improve the operating efficiency and product quality of the lime kiln. Contact Rongsheng manufacturers for free samples and quotations.

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Mar 17 2025

The Use of Mullite PolyLight Bricks and the Use Temperature of Different Grades

Mullite polylight bricks are generally marked with JM, where J is the first letter of the pinyin of polylight and M is the first letter of the pinyin of mullite. They are mainly used for heat preservation in the linings of various high-temperature furnaces to improve the heat preservation effect of high-temperature furnaces and reduce energy consumption. Mullite polylight bricks are also used in the heat preservation of equipment in thermal power plants, nuclear power plants, etc.

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The Use Temperature of Different Grades of Mullite Polylight Bricks

However, different grades of mullite polylight bricks are used at different temperatures. Insulation mullite bricks are generally divided into different grades of JM-23, JM-26, JM-28, JM-30, and JM-32 according to national standards. JM-32 is not used much. The use ratio of JM-23, 26, and 28 is more.

JM-23 mullite polylight bricks, Al2O3 is 48%, and the use temperature is 1300℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1300℃×24h is ±1.
JM26 mullite polylight bricks, Al2O3≥55%, and the use temperature is 1400℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1400℃×24h to 0.7-0.8.
JM28 mullite poly light brick, Al2O3 at 65%, use temperature at 1500℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1500℃×24h to 0.7.
JM30 Al2O3 at 72%, use temperature at 1600℃. The volume density ranges from 0.55-1.5, and the most commonly used are 0.8 and 1.0 and body density. Its reburning line changes at 1600℃×24h to 0.6.
JM32 is not often used, and is generally customized according to the special requirements of users.

Different grades of mullite poly light bricks can be used at different use temperatures. Different grades of mullite bricks are selected according to the temperature and use conditions of the user’s kiln and different furnace types. Rongsheng Refractory Factory can also customize and produce polylight mullite bricks according to customer’s specifications.

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High Temperature Furnace Mullite Insulation Refractory Brick Factory

Mullite insulation brick physical and chemical indicators. Mullite insulation brick, as a material commonly used in building insulation, has excellent insulation performance and mechanical strength. Rongsheng Refractory Factory will elaborate on the physical and chemical indicators of mullite insulation bricks, covering thermal conductivity, compressive strength, water absorption and other aspects.

Heat conductivity is an indicator to measure the thermal conductivity of materials, usually expressed as λ, with the unit of W/(m・K). The thermal conductivity of mullite insulation bricks is mainly affected by factors such as the density, porosity and composition of the material. Generally speaking, the lower the density and the higher the porosity of mullite insulation bricks, the lower its thermal conductivity. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K) to ensure its excellent insulation performance. To achieve this requirement, manufacturers usually take measures such as controlling the raw material ratio and optimizing the process to reduce the thermal conductivity of the brick body.
Compressive strength is an indicator used to measure the compressive performance of materials, usually expressed in MPa. The compressive strength of mullite insulation bricks is directly related to their service life and safety performance in building structures. Generally speaking, the higher the compressive strength of mullite insulation bricks, the more they can withstand external loads. According to national standards, the compressive strength of mullite insulation bricks should be greater than 1.5MPa. In order to improve the compressive strength of mullite insulation bricks, manufacturers usually use methods such as adding reinforcing materials and adjusting the firing process to improve them.
Thermal conductivity is an indicator that describes the thermal conductivity of a material, usually expressed in K, with a unit of W/(m・K). The thermal conductivity of mullite insulation bricks is the ratio of thermal conductivity to material thickness, which is used to calculate heat transfer per unit area. According to national standards, the thermal conductivity of mullite insulation bricks should be less than 0.065W/(m・K). By controlling the thermal conductivity and thickness of the brick body, the thermal conductivity of mullite insulation bricks can be effectively reduced and its insulation performance can be improved.
Density is an indicator that measures the relationship between material mass and volume, usually expressed as ρ, with the unit of kg/m³. The density of mullite insulation brick directly affects its thermal conductivity and compressive strength. Generally speaking, the lower the density of mullite insulation brick, the lower its thermal conductivity, but the compressive strength will also be reduced accordingly. Therefore, when designing, it is necessary to weigh the requirements of thermal insulation performance and structural strength and select an appropriate density.

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Rongsheng Mullite Insulation Brick

The physical and chemical indicators of mullite insulation bricks are an important basis for evaluating their insulation performance and performance. By controlling the thermal conductivity, compressive strength, water absorption and other indicators of the brick body, the insulation effect and service life of mullite insulation bricks can be improved.

In actual use, it is necessary to select suitable mullite insulation bricks based on the specific requirements and environmental conditions of the building. At the same time, manufacturers also need to continuously improve the process and material formula to improve the performance and quality of mullite insulation bricks to meet market demand.

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Feb 27 2025

How to Enhance the Strength of Circulating Fluidized Bed Boiler Lining?

The strength of the circulating fluidized bed boiler lining is very important. If the material is not properly selected or the quality control is not done well during the construction process, it is easy to cause large-scale collapse of the castable during operation and even serious wear of the heating surface pipes.

Enhance the Strength of Circulating Fluidized Bed Boiler Lining?

Selection of wear-resistant refractory manufacturers. Since there are many manufacturers of wear-resistant refractory materials on the market, and the quality is uneven, you must pay attention when selecting a manufacturer. It is best to contract the materials, construction and after-sales service to a reputable and qualified manufacturer. In this way, the circulating fluidized bed boiler lining can be guaranteed to the maximum extent. RS Refractory Manufacturer is a powerful refractory manufacturer with rich experience in the production and sales of refractory materials. RS manufacturer has completed many turnkey projects in the design, construction and material supply of circulating fluidized bed boiler refractory lining. If you choose RS manufacturer, RS manufacturer’s products and customer service will not disappoint you.

Circulating Fluidized Bed Boiler Lining Construction

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Material selection. Start with the physical and chemical properties of the material (including wear resistance, heat resistance, corrosion resistance, thermal conductivity, stability, thermal expansion, shrinkage, compression and bending resistance and bulk density), while taking into account economy. Combine the characteristics of the lining part, the structure of the components that carry the lining, and the requirements of temperature resistance and wear resistance for comprehensive comparison. Be advanced in technology, reliable in structure and economically reasonable.

CFB lining materials have been developing continuously with the development of boilers towards high parameters, large capacity and new technologies, and many new varieties, new construction methods and technologies have been developed. This has promoted the innovation and improvement of lining structures, continuously improved wear resistance and heat resistance, and promoted the progress of fluidized bed combustion technology. RS manufacturers suggest that accurate design solutions, high-quality material selection, efficient construction quality and maintenance methods can greatly increase the strength of circulating fluidized bed boiler linings.

Why does the Circulating Fluidized Bed Boiler Lining need High-Strength Wear-Resistant Castables?

The main reasons why the circulating fluidized bed boiler lining needs to use high-strength wear-resistant castables are as follows. First of all, the circulating fluidized bed boiler is a high-efficiency, low-pollution boiler with good fuel adaptability, so its operating efficiency and application range have been widely used. However, during the operation of this boiler, due to incomplete combustion of fuel and uneven heat exchange, the temperature and material flow rate in the furnace will be unevenly distributed, causing serious wear and scouring of the boiler lining. Therefore, in order to protect the circulating fluidized bed boiler lining, high-strength wear-resistant castables are needed.

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Secondly, high-strength wear-resistant castables are a composite material composed of a variety of polymer materials and wear-resistant materials, with the advantages of high strength, high wear resistance, high temperature resistance, and corrosion resistance. This material can maintain its physical and chemical properties for a long time under a high-temperature environment, and effectively resist high temperature and chemical corrosion in the furnace. In addition, high-strength wear-resistant castables also have good impact resistance and wear resistance, which can effectively resist the high-speed impact and friction of materials and protect the lining from damage.

Finally, the construction of high-strength wear-resistant castables is simple and fast and can be customized according to the shape and size of the boiler, with strong adaptability. This material does not produce harmful gases during the pouring process, which can effectively protect the environment and workers’ health. In addition, the price of high-strength wear-resistant castables is also relatively reasonable, which can effectively reduce the maintenance cost of the boiler.

In summary, the lining of the circulating fluidized bed boiler needs to use high-strength wear-resistant castables to protect it from damage such as incomplete combustion of fuel, material impact and friction, extend its service life, and improve the operating efficiency and application range of the boiler.

Where is the Main Function of Wear-Resistant Castables?

As the name suggests, wear-resistant castables have extremely high wear resistance and can maintain the integrity of the cast body for a long time in harsh working environments. Its wear resistance is better than that of traditional high-aluminum refractory castables, and can extend its service life in key furnace linings. In metallurgy, power and other industries, wear-resistant castables are widely used in rotary kilns, boilers, dust collectors and wear-resistant layers of complex furnace linings, which can effectively resist the erosion of ores, metal materials, high temperatures and chemicals, and improve the operating efficiency of equipment.

Wear-Resistant Corundum Silicon Carbide Castable

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Wear-resistant castables have good corrosion resistance due to the addition of silicon carbide components, which play a skeleton support role and can resist the erosion of various acid and alkali chemicals. In the chemical, petrochemical and other industries, wear-resistant castables are suitable for anti-corrosion layers, which effectively prevent corrosive media from eroding the furnace lining and ensure the stability and safety of the production process.

Wear-resistant refractory castables have high compressive strength and can withstand greater pressure and impact. Moreover, it has good thermal shock resistance, which can reduce the wear and failure rate of the furnace lining, thereby reducing energy consumption and production costs. This helps to reduce the operating costs of enterprises and improve their competitiveness. At the same time, wear-resistant castables also have the characteristics of environmental protection and sustainable development. Their production and use processes meet environmental protection requirements and are conducive to reducing the generation of industrial waste.

In summary, wear-resistant castables play an important role in improving wear resistance, enhancing corrosion resistance, improving compressive strength and reducing energy consumption. It is one of the important refractory castables that are indispensable for industrial kiln linings.

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Feb 6 2025

Why can Mullite Bricks be Used as Thermal Insulation Materials?

Mullite brick is a refractory brick made mainly of mullite, a mineral compound composed of alumina (Al2O3) and silicon dioxide (SiO2). It is famous for its excellent thermal stability, high melting point and thermal shock resistance. Why can mullite brick be used as thermal insulation material? First of all, we need to understand the characteristics of mullite brick.

Features of RS Premium Mullite Bricks

RS premium mullite bricks have some of the following key features:

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High-temperature resistance: Mullite bricks can withstand high temperatures, typically ranging from 1600°C (2912°F) to 1800°C (3272°F). Even at high temperatures, it maintains strength and structural integrity, making it suitable for use in high-temperature conditions.
Low thermal conductivity: Mullite bricks have low thermal conductivity, which means it can provide good insulation and reduce heat loss in high-temperature environments. This feature makes it valuable for applications that require insulation or energy efficiency.
Excellent thermal shock resistance: Mullite bricks have excellent thermal shock resistance, which means it can withstand rapid temperature changes without cracking or flaking. This feature is critical for applications involving cyclic heating and cooling, such as furnaces, kilns, and reactors.
Chemical resistance: Mullite bricks have good resistance to chemical attack by acids, alkalis, and molten materials. This makes it suitable for chemical processing, metal refining and other industrial applications that may come into contact with corrosive substances.
Wide application: Mullite bricks are widely used in various industries such as ceramics, glass manufacturing, steel production, petrochemicals, and non-ferrous metals. It is often used in furnace linings, kiln furniture, hot gas pipes, regenerators and other demanding thermal environments.

RS factory mullite bricks are available in different shapes and sizes to meet specific installation requirements. For example, standard bricks, special shapes or custom designs. Contact Rongsheng for detailed information.

Why can Mullite Bricks be Used as Thermal Insulation Materials?

In general, mullite bricks have high-temperature resistance, thermal shock resistance, and chemical durability. This makes it a valuable refractory material in many industrial environments. In these industrial environments, reliable heat conduction and thermal stability are essential.

JM26 Lightweight Mullite Insulation Bricks for Sale

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Mullite polylight bricks are a kind of lightweight insulation bricks, also known as mullite insulation bricks. It has good thermal insulation effect, and its small body density and light weight are also one of its characteristics. At present, it is widely used in glass melting furnace upper structure material channel bricks, modification plates, and processing kiln upper structure. Insulation and heat insulation layer of firing kilns, smelting kilns, refining devices, heating devices, and other thermal equipment.

Because mullite polylight insulation bricks have a high porosity, they cannot bear excessive loads when using mullite insulation bricks, and must avoid contact with molten metal, slag and high-temperature furnace dust. When laying mullite insulation bricks, brick joints and expansion joints should be arranged correctly to avoid squeezing the masonry due to expansion. Mullite insulation bricks should not be subjected to strong mechanical vibration, impact and friction.

Layered structure: The molecular structure of mullite has a layered arrangement, which allows it to expand when heated to form an insulating air layer. This structure enables mullite bricks to effectively reduce the conduction of heat. Therefore, it exhibits good thermal insulation performance in high temperature environments.

Lightweight material: Mullite bricks are a lightweight material, so they do not add much weight when used in construction. This makes it suitable for various insulation applications, such as insulation boards, insulation materials, and furnace linings.

Refractory: Mullite bricks have high refractory properties and can withstand high temperatures without decomposing or melting. This makes it an ideal insulation material for high-temperature equipment such as furnaces, stoves, fireplaces, etc.

In general, the reason why mullite polylight bricks can be used as insulation materials is mainly because its density, chemical properties, layered structure, lightweight characteristics and refractory properties make it have good thermal insulation performance in high temperature environments. These characteristics make it one of the important materials in a variety of industrial and construction applications.

Are Lightweight Mullite Bricks Acid-Resistant?

Lightweight mullite bricks usually have a certain degree of acid resistance, but their specific corrosion resistance will be affected by many factors, including the composition of mullite bricks, preparation process, strength of acidic environment and special requirements.

Mullite brick is a refractory material with mullite as the main component. Mullite is a mixture of alumina (Al2O3) and aluminum silicate (Al2Si2O7), which has good high temperature resistance, thermal shock resistance and corrosion resistance. Mullite bricks contain a higher proportion of alumina, which makes it acid-resistant to a certain extent.

However, the strength and type of acidic environment also have an impact on the corrosion resistance of mullite bricks. Generally speaking, mullite bricks may show good corrosion resistance in mildly acidic environments, but corrosion may still occur in harsh strong acidic environments.

If mullite bricks need to be used in special acidic environments, it is recommended to understand their corrosion resistance in detail when selecting materials, and may take additional protective measures. For example, adding anti-corrosion coating or choosing other corrosion-resistant materials that are more suitable for specific acidic environments. It is recommended to conduct relevant experiments and tests before actual use to ensure that lightweight mullite bricks can meet the requirements in specific acidic environments.

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Jan 16 2025

8 Characteristics of Honeycomb Ceramic Catalyst Carrier

The main material of honeycomb ceramic carrier is cordierite. The honeycomb ceramic material used for automobile exhaust treatment is often porous cordierite, which mainly provides an inert physical structure for carrying the catalyst coating. The thermal expansion coefficient of cordierite is 2.9X10-6/℃. The melting point is about 1460℃, and it has good thermal stability. Cordierite has two homogeneous multiphase variants, namely low-temperature cordierite and high-temperature cordierite. High-temperature cordierite is also known as Indialite, which belongs to the hexagonal system; low-temperature cordierite is what people usually call cordierite, which belongs to the orthorhombic system. Rongsheng cordierite honeycomb ceramic manufacturer provides high-quality cordierite honeycomb ceramic products. Contact Rongsheng for detailed information.

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Honeycomb Ceramic Catalyst Carrier

In order to have a larger catalytic surface in a smaller volume, the surface of the catalyst carrier is made into a honeycomb shape. The biggest advantage is that it has a large specific surface, a low thermal expansion coefficient, excellent thermal shock resistance, strong acid and alkali resistance and corrosion resistance, and has high mechanical strength.

As a carrier, honeycomb ceramic is a key component of the three-way catalytic converter. One of its important materials is cordierite, which is resistant to high temperatures, has a high continuous operating temperature of up to 1200°C, high strength and low linear expansion coefficient. The carrier adopts an effective surface and a suitable pore structure. The ceramic carrier has an opening rate of 400-600 mesh/inch2 and a minimum wall thickness of about 0.16mm. It can enhance the mechanical strength of the catalyst, and also improve its resistance to wear, impact, gravity, pressure, high temperature and phase change. Improve the conductivity of the catalyst and reduce the content of active components. Especially when using precious metal catalysts such as platinum, palladium and rhodium, the active components can be highly dispersed and the dosage can be reduced.

In short, the quality of the carrier is extremely important for the catalyst. The mesh number of the honeycomb ceramic carrier can be 200 mesh, 300 mesh, 400 mesh or 600 mesh. The cross-sectional shapes include circular, racetrack, elliptical and some special shapes according to customer requirements, in order to meet the needs of different application conditions.

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Characteristics of Honeycomb Ceramic Catalyst Carrier

Honeycomb ceramic catalyst carrier has eight significant advantages, as follows:

Thin pore wall, large specific surface area, low resistance, low bulk density, high compressive strength.
Small thermal expansion coefficient.
Good thermal shock resistance and thermal shock resistance.
Good matching with various catalyst active components.
Good cold start performance, low ignition temperature, fast heating, small gas resistance, high conversion efficiency.
Spiral, double S and three-core core structures can be produced according to user requirements.
It can be designed into cylindrical, runway and other special-shaped structures according to the requirements of different motor vehicles.
The product meets the manufacturing and supporting requirements of various scales and models of motor vehicles and meets Euro III and more stringent emission standards.

Application of Cordierite Ceramics

Square mirrors for photolithography

As one of the core units of a photolithography machine, the motion accuracy of the ultra-precision worktable directly affects the resolution of the photolithography machine. As the core component of the worktable, the square mirror guarantees the accuracy of the worktable and the efficiency of photolithography. The thermal load on the square mirror during operation will change continuously due to the influence of the heat flow in the working space, requiring its deformation to change as little as possible with temperature. At the same time, it is also necessary to deal with the distortion correction caused by its operation at higher acceleration and speed. Therefore, in order to meet the requirements of photolithography accuracy, the thermal expansion coefficient of the square mirror material must achieve near-zero expansion at the working temperature, and it must also have good mechanical properties. Cordierite ceramics are ideal materials for square mirrors for photolithography machines due to their low thermal expansion coefficient, excellent mechanical properties and low density. ASML has achieved mature application and promotion of cordierite ceramics in the mobile platform components of photolithography machines.

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Optical mirrors for optical communication

Cordierite has the characteristics of low thermal expansion, high mechanical strength and high rigidity, long-term dimensional stability, and radiation resistance, and can be used in space optical communication. Sony CSL has adopted Kyocera cordierite ceramic mirrors for small near-Earth orbit security laser communication terminals.

Refractory materials

Cordierite ceramics are often used as ceramic packaging materials and kiln tools during the use of kilns due to their low thermal expansion coefficient. At the same time, cordierite ceramics have the characteristics of low density, low thermal conductivity and good high-temperature stability, and can also be used in heat exchange devices with fast temperature changes, such as heat-resistant pots. There are a large number of gaps between the six-membered rings of cordierite crystals and between the upper and lower adjacent six-membered rings. This loose crystal structure gives it an extremely low thermal expansion coefficient, and can be used as a lost foam refractory coating during the casting process, improving the precision of the casting.

Catalyst carrier

Cordierite has a loose crystal structure and a low thermal expansion coefficient, so it can be made into a porous cordierite catalyst carrier. The service environment of the catalyst carrier material is complex and has high requirements for material performance. In particular, the monolithic catalyst used for automobile exhaust treatment, during the operation of the engine, due to the effect of thermal shock, the temperature of the exhaust gas rises to about 700°C in a few seconds. When the engine stops, the temperature drops rapidly to the ambient temperature. A good automobile exhaust monolithic catalyst needs to repeat this process thousands of times, and the carrier needs to support the catalyst and ensure mechanical strength. Cordierite ceramics also have good thermal shock resistance, thermal shock resistance, chemical stability and certain mechanical strength, and are also widely used in water pollution treatment.

Microwave communication dielectric materials

Cordierite ceramics have a low dielectric constant and a near-zero frequency temperature coefficient. It is an ideal low-dielectric high-frequency microwave dielectric ceramic, which is used in the preparation of electronic packaging dielectric resonant antennas, microwave device substrates, high-end microwave components and other devices.

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Dec 3 2024

Compactness of Magnesia-Aluminum Spinel Rich in Magnesium Oxide

Application of magnesia-alumina spinel bricks in cement kilns. At present, the chromium-free measures taken by the new dry process cement kiln are mainly to replace magnesia-chrome bricks with magnesia-dolomite bricks, magnesia-alumina spinel bricks, and magnesia-iron-alumina spinel bricks (referred to as magnesia-iron bricks). Its kiln lining performance is very outstanding, and it is the best material to replace magnesia-chrome bricks in domestic cement kilns.

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The magnesia-alumina spinel bricks produced by introducing ferroalumina spinel into magnesia refractory materials provide a new lining concept for cement rotary kilns. Its good structural flexibility and excellent kiln lining performance provide it with high adaptability. In recent years, magnesia-alumina spinel bricks have been fully used in the high-temperature zone of cement rotary kilns. Rongsheng refractory manufacturer can provide high-quality magnesia refractory brick products for cement kilns, including magnesia-dolomite bricks, magnesia-alumina spinel bricks, and magnesia-alumina spinel bricks. Contact Rongsheng for a free quote.

Material Properties of Magnesia-Alumina Spinel

Magnesia-alumina spinel is one of the most important refractory materials in the steel and cement industries. It has gradually replaced chromium spinel and is also a popular refractory material in the above fields. However, magnesium-chromium alloys and Al2O3-chromium alloys are gradually decreasing due to the environmental hazards of hexavalent chromium. Magnesium-alumina spinel has excellent refractory properties such as high refractoriness, moderate thermal expansion, thermal shock stability and resistance to slag erosion.

The densification of spinel by primary firing requires very high temperatures (>1700℃) because the oxide composition is accompanied by a 7% volume expansion during the spinel formation process. On the other hand, the expansion during the spinel formation process is beneficial for Al2O3-MgO-C (AMC) bricks. Because the expansion during the in-situ spinel formation process minimizes the gaps between bricks and prevents metal infiltration.

The formation and sintering of spinel have been studied by different researchers by changing the raw materials and processing steps. Mansour et al. pointed out that the most spinel is formed when the calcination temperature of raw materials MgCO3 and Al(OH)3 is 900℃ and 1100℃ respectively. Gray believes that hydroxide contributes to the formation of spinel and the densification of magnesium-aluminum spinel. Kostic et al. found that fine grinding of raw materials will increase its specific surface area and increase its structural defects, which will lead to the formation of low-temperature spinel.

Magnesia-Rich Magnesia-Alumina Spinel

Magnesia-rich magnesia-alumina spinel is mainly used in cement kilns because of its compatibility with the products of cement formation process. Compactness of MgO-rich magnesia-aluminum spinel. Alper in the study of MgO-Al2O3 binary system showed that the solubility of MgO in the spinel phase was 39%. Bailey et al. found that the presence of excess MgO in the spinel phase would restrict the growth of spinel grains and promote sintering. Cooper et al. found that 40% MgO in magnesia spinel bricks would improve its thermal and corrosion properties. India has a large reserve of magnesia ore, which contains impurities such as CaO, SiO2 and Fe2O3 that limit its application at high temperatures. In the present study, natural magnesia ore has harmful impurities SiO2 and CaO. As a magnesia-rich magnesia-alumina spinel aggregate, it was developed and compared with the aggregate prepared by synthetic calcined magnesia.

Dense Magnesium Aluminate Spinel

Through various experiments, researchers have a unique understanding of dense magnesium aluminate spinel bricks.

1) The density of sintered spinel generated by Salem magnesite (SS) increases sharply between 1400℃ and 1500℃, followed by a slight decrease at higher temperatures due to liquid phase sintering. The spinel generated by caustic magnesia (NS) densifies slowly below 1500℃, followed by an improvement in density at 1600℃. The NS sample is densified by solid phase sintering.

2) X-ray diffraction analysis of the SS sample sintered at 1600℃ shows that spinel and periclase are the main phases, and forsterite is the secondary phase. This is because SiO2 exists in natural magnesite, while the NS sample only contains periclase and spinel phases.

3) As the temperature increases from 1500℃ to 1600℃, the flexural strength of the NS sample increases due to its more compactness. However, compared with the SS sample sintered at 1500℃, the flexural strength of the SS sample sintered at 1600℃ is lower, which is due to the presence of the low melting point phase and the uneven particle size distribution.

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Blog Ceramics Refractories

Nov 1 2024

How to Choose Cordierite Slab as Baking Board?

Because of its low price and strong thermal stability, cordierite baking slabs have shown explosive growth in recent years, defeating competitors such as ceramic slabs and volcanic slabs, and becoming the first choice for home and commercial pizza and bread baking.

“Slate” is passed on by word of mouth among baking enthusiasts, but most people don’t know how to distinguish it. Some are much cheaper, but they are quite heavy to pick up, and you think the quality is good. In fact, as long as you look at the appearance carefully, you can see a lot of differences.

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How do you Identify High-Quality Cordierite Baked Slabs?

There are certain processes in the manufacture of cordierite slabs, from raw material processing and mixing to pressing, drying, firing, and later grinding packaging, and other processing. The differences in processing in these aspects by different manufacturers determine the different costs. RS manufacturers provide high-quality cordierite slabs for wholesale sales. The price is fair.

Differences in raw material quality and mix ratio

The main raw material content of cordierite slabs is of course cordierite, and some clay mineral soils are also mixed to form and improve properties. Cordierite with a very low thermal expansion coefficient plays a vital role in the thermal stability of the slab. Therefore, the quality and amount of cordierite largely determine the refractoriness of the slab.

The raw material cordierite needs to be sintered. The higher the sintering temperature, the higher the cost, and it will look whiter after firing.

After mixing with other materials (usually colorants are added), pressing and sintering, the color of cordierite can no longer be distinguished. Moreover, the impact on refractoriness is not as obvious as reducing the content of cordierite. Simply put, the addition of additives will not directly affect the refractoriness of cordierite slabs.

Generally, the temperature used by home users is limited and the frequency of use is not high. Therefore, some manufacturers will reduce costs by reducing the amount of relatively expensive cordierite. This will directly lead to a decrease in refractoriness, easy cracking during rapid cooling and heating, and faster aging of the slab.

Raw material processing process

Before mixing various raw materials, some processing is required. For example, one step that has a greater impact on the appearance of the finished product is to remove the larger iron impurities in the raw materials. Because iron impurities have a greater impact on the appearance of the finished product, it is difficult to completely remove them using a simple process, and generally the larger particles are isolated.

Since iron impurities are difficult to completely remove, even if the surface of the product is relatively clean after iron removal, it is inevitable that there will be some black spots after high-temperature firing. Therefore, some manufacturers will skip the iron removal process to save some time and labor costs. However, if large iron impurities are not removed, dense iron particles will appear on the surface of the product after firing.

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Firing temperature and firing time

Firing is a very important process in the manufacture of stone slabs, which has a great impact on the quality of the product. Sufficient firing time and appropriate firing temperature (generally 1200 degrees Celsius) can make the stone slab fully sintered, harder, and more refractory.

The surface of the fully sintered stone slab is firm and flat.

The powder on the surface of the unsintered stone slab will fall off, and the particles on the surface seem to fall off easily. The so-called powder loss is the foreign dust accumulated on the surface, which will disappear after washing. However, the powder loss caused by insufficient sintering is the shedding of the material of the stone slab itself.

Some unsintered products have particularly serious powder loss.

Shortening the firing time and lowering the temperature can reduce fuel consumption. More finished products can be fired in the same time, which can naturally reduce costs. That’s why some stone slabs can be sold at very low prices. The cordierite slabs of RS manufacturers are of reliable quality, factory direct sales, and guaranteed after-sales service. Contact RS for free samples and quotes.

Subsequent grinding and packaging

Mineral powder is very soft and needs to be stamped into shape with a large-tonnage press. Different shapes and sizes require different molds. The mold consists of several parts. The upper and lower mold cores and the frame form a closed shape. There is a certain gap between the frame and the core, so the edge of the stamped embryo will be rough. The embryo is very soft before firing and is inconvenient to grind. It can only be done after sintering and forming with hardness. Whether it is semi-automatic machine grinding or manual grinding, it is a time-consuming and labor-intensive process.

Of course, not grinding can also save some costs. Some manufacturers will not grind at all to save labor costs.

Through the above description, I believe that you will soon find out whether the cordierite slab you bought is the one with the highest cost performance. Identifying the differences and differences in the quality of cordierite slabs will also understand the difference of “you get what you pay for”. I hope you can buy a product that suits your taste.

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Blog

Oct 10 2024

Application of 7-Hole, 19-Hole, 31-Hole and 37-Hole Checker Bricks in Hot Blast Furnaces

Lattice brick, this term may not be common in the daily life of ordinary people, but in the iron-making industry, it is widely recognized and accepted as a heat transfer and heat storage body with many superior thermal characteristics such as strong heat exchange capacity, large heat storage area, smooth ventilation, and low resistance. Rongsheng Checker Bricks, English name Lattice brick, is a heat transfer medium, mainly used in the upper and middle parts of the heat storage chamber of the hot blast furnace to store heat. In the process of heating cold air into hot air, lattice brick plays an extremely important role.

7-Hole, 19-Hole, 31-Hole and 37-Hole Hot Blast Furnace Checker Bricks

Checker bricks, the name may sound a bit mysterious, but it actually plays a very important role in industry. In hot blast furnaces, glass kilns and coke oven regenerators, it is like a passionate heat transfer messenger, helping hot and cold gases to complete heat exchange.

Rongsheng Checker Bricks for Glass Kilns — Rongsheng Checker Bricks

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So, what is so special about checker bricks? First of all, its design is very clever, with bricks with grid holes arranged in an orderly manner. These grid holes allow hot and cold gases to pass freely, thereby achieving efficient heat exchange.

The characteristics of checker bricks are also quite significant:

Strong heat exchange capacity: can quickly transfer heat to cold gas.
Large heat storage area: store more heat and reduce energy consumption.
Smooth ventilation: ensure smooth passage of gas without affecting heat exchange.
Good volume stability: can maintain the shape even at high temperatures.
High-temperature load creep performance: the performance remains stable under high temperatures and high load.

According to the material classification, checker bricks can be divided into clay, high alumina, mullite, silica and sillimanite and other types. And according to the specification classification, there are 7 holes, 19 holes, 31 holes and 37 holes and other options.

Whether in hot blast furnaces, glass kilns or coke oven regenerators, checker bricks are an indispensable part. It not only affects the operating efficiency of the entire system, but also directly affects the safety and stability of production. Therefore, choosing the right checker brick is a crucial decision for every industrial producer.

Checker Refractory Bricks Used in Blast Furnace

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The Volume Stability of the Hot Blast Furnace Checker Brick is Good

The checker brick has multiple transparent grid holes parallel to the side surface, as well as positioning protrusions and positioning grooves on two parallel surfaces. These designs not only make it ventilated smoothly and with low resistance, but also greatly enhance its heat exchange capacity and heat storage area. In addition, the checker brick has good volume stability, excellent high temperature load creep performance, high density and low porosity, which enables it to maintain excellent performance under high temperature and high pressure working environment.

Blast furnace hot blast furnaces usually adopt a checker brick regenerator structure, which transfers heat to the checker bricks by passing the high temperature flue gas after combustion through the holes of the checker bricks. Then during the air supply period, the cold air is heated into hot air through the checker bricks, and then sent to the blast furnace through the hot air pipe for combustion reaction. The aperture and heating area of the checker bricks have a direct impact on the performance of the hot blast furnace. The old blast furnace hot blast furnace uses standard checker bricks with an aperture of 40 mm and a heating area of 32.7 square meters per cubic meter. The Kalugin top-fired hot blast furnace uses checker bricks with smaller apertures and larger heating areas, such as checker bricks with an aperture of 30 mm and a heating area of 48 square meters per cubic meter, and checker bricks with an aperture of 20 mm and a heating area of 64 square meters per cubic meter. These improvements not only improve the thermal efficiency of the hot blast furnace, but also significantly reduce the amount of refractory materials used and investment costs of the hot blast furnace.

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With the technological development of the ironmaking industry in the metallurgical industry, increasing the air temperature of the hot blast furnace has become an important measure. The technological development of the Kalugin top-fired hot blast furnace has enabled the maximum air temperature of the blast furnace hot blast furnace to reach 1350 degrees. Under this trend, 20 mm aperture checker bricks have become the first choice for modern hot blast furnaces due to their higher heating area and lower dosage. In blast furnace hot blast furnaces in Russia, China, Kazakhstan, Ukraine and other places, 20 mm aperture checker bricks have been widely used.

The application of checker bricks is not limited to blast furnace hot blast furnaces, it is also used in other industrial fields such as flame furnaces. According to different temperature zones and technical requirements, checker bricks of different materials are generally selected, such as siliceous checker bricks, clay bricks, high alumina bricks, mullite bricks, sillimanite bricks, etc. These checker bricks provide strong heat exchange and heat storage capacity for industrial production with their unique structure and performance.

In general, checker bricks have become an indispensable and important material in the ironmaking industry with their superior thermal properties and wide application fields. Its design and application not only reflect the continuous exploration and innovation of human beings in industrial technology, but also provide more possibilities and opportunities for our future industrial production. Contact Rongsheng for more information.

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Blog Cement Kiln Refractory

Sep 19 2024

Manufacturer of Magnesia Alumina Spinel Bricks for Cement Kilns

Magnesia-alumina spinel bricks are made of high-purity magnesia sand and pre-synthesized magnesia-alumina spinel as the main raw materials and are made after reasonable grading, high-pressure molding, and high-temperature firing. Rongsheng is a manufacturer of magnesia-alumina spinel bricks for cement kilns. Magnesia-alumina spinel bricks are characterized by high purity, high strength, corrosion resistance, low linear expansion coefficient, and good thermal shock resistance. They are ideal refractory materials for the transition zone of cement rotary kilns.

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Production of Magnesium Aluminum Spinel Bricks

The amount of magnesium aluminate spinel added to the ingredients of magnesium aluminate spinel brick production is not the more the better. With the increase of spinel amount, the thermal shock resistance becomes better. However, due to mismatched expansion, the strength (especially flexural strength) will decrease. Taking Al2O3 as the standard, the Al2O3 in the product should not be greater than 15%~20%, and 10%~18% is preferred. The main impurity in magnesium aluminate spinel bricks is SiO2, which should not be greater than 1.5%.

Over the past thirty years, people have been pursuing technologies to replace magnesium chrome bricks to eliminate hexavalent chromium pollution, and first placed their hopes on periclase spinel bricks. When spinel bricks entered China with the introduction of six new dry kilns at a price of more than $1,000 per ton, China saw a fever for spinel bricks. The initial reports were optimistic, but gradually different news came from the cement plants: “It can’t hold the kiln skin.” It turns out that the eutectic temperature of spinel bricks and cement is close to (slightly lower) the firing temperature of cement, which is fatal. Therefore, spinel bricks retreated 15~20m in the lining of Chinese cement kilns and reached the upper transition zone. They occupied the position of high-alumina bricks or ordinary magnesia-chrome bricks.

Regardless of M-A series or M-K series products, the academic community agrees that Fe2O3 affects the product’s resistance to atmosphere changes. One of the explanations for the superiority of spinel bricks over magnesia-chrome bricks in the upper transition zone is that the Fe2O3 content is lower than that of M-K series products. However, Yoshiki Tsuchiya of Japan added 4% Fe2 O3 to spinel bricks to improve the brittleness of the bricks. The expansion rate is only 1.13% at 1000℃, the flexural strength is 12MPa, and the wear is 30mm in 8 months in the area of 3840m of φ5.0SP kiln. The wear of commonly used spinel bricks is 80~120mm, and it is said that this high iron brick can hang on the kiln skin when used in the firing zone.

Magnesia Aluminum Spinel Bricks Advantages

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Performance Advantages of Spinel Bricks

Spinel bricks are better than ordinary magnesia-chrome bricks in thermal shock resistance, R+ alkali corrosion resistance, acidic gas corrosion resistance, and atmosphere change resistance. However, for refractory bricks used in transition belts and unloading belts on cement kilns, should also have low thermal conductivity, good wear resistance, and high shear fracture resistance. It determines the availability of spinel bricks. China has been using spinel bricks for about 20 years. The most basic problem exposed is the high cylinder temperature. The cylinder temperature of a 200~220mm thick kiln lining will rise to 350℃ or even close to 400℃ within 100 days of operation. The wear resistance is poor, and it is rare to be able to operate stably for more than 8 months on a 2500t kiln.

The ingredients of periclase spinel bricks in my country use sintered high-purity magnesia sand, medium-grade magnesia sand, and synthetic spinel sand (SiO2 0.6%~2.0%). The thermal shock resistance index is generally more than 10 times, and the best ones are more than 20 times. However, the high-temperature flexural strength is low (1400℃, 0.5h), which is roughly 23MPa, and most products are less than 3MPa. This is a technology that spinel bricks need to improve. Spinel bricks for cement kilns. Magnesium-aluminum spinel bricks for cement kilns.

The advantages of spinel bricks are good thermal shock resistance. During use, they react with clinker to form a very thin calcium aluminate protective layer on the surface of spinel bricks. It makes the liquid phase difficult to penetrate, and the anti-stripping performance is better than that of directly bonded magnesia-chrome bricks. When used in the cooling zone and transition zone of the cement kiln, the service life is doubled compared to that of directly bonded magnesia-chrome bricks. However, it is slightly inferior to directly bonded magnesia-chrome bricks in terms of corrosion resistance. At the same time, spinel bricks are easy to hydrate, have a large thermal conductivity, and the kiln shell temperature is higher than when using directly bonded magnesia-chrome bricks.

Spinel Refractory Bricks for the Transition Zone

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Application of Rongsheng Magnesium Aluminum Spinel Brick in the Transition Zone of Cement Rotary Kiln

Magnesium aluminum spinel brick is a product made of high-purity magnesia sand and pre-synthesized magnesium aluminum spinel as the main raw materials, after reasonable grading, high-pressure molding and high-temperature firing. It is characterized by high strength, corrosion resistance, low linear expansion coefficient, and good thermal shock resistance. It is an ideal refractory material for the transition zone of cement rotary kiln.

Bauxite-based sintered magnesium aluminum spinel uses high-quality alumina with an Al2O3 content of more than 76% and high-quality light-burned magnesium powder with an MgO content of more than 95%. After a multi-stage homogenization process, it is sintered at a high temperature of more than 1800°C in an ultra-high temperature tunnel kiln. It has a large volume density, a high mineral phase content, good grain development, uniform structure, and stable quality. Magnesium aluminum spinel has good erosion resistance, strong corrosion and spalling ability, good slag resistance, abrasion resistance, good thermal shock stability, and high temperature resistance. It is a magnesium aluminum spinel brick for the high temperature zone of the rotary kiln for producing cement. It is also an ideal raw material for refractory products such as ladle lining bricks and ladle castables. Magnesium-aluminum spinel is widely used in refractory materials, steel smelting, cement rotary kilns and glass industrial kilns.

It has good erosion resistance, abrasion resistance and thermal shock stability. Its main uses: First, it replaces magnesia-chrome sand to make magnesia-aluminum spinel bricks for cement rotary kilns, which not only avoids chromium pollution, but also has good spalling resistance. Second, it is used to make ladle castables, which greatly improves the erosion resistance of steel plate linings. It is widely used in refractory materials for steelmaking.

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Product Characteristics of Rongsheng Magnesium Aluminum Spinel Bricks

Excellent kiln skin performance.
Low thermal conductivity (1000℃, 2.27w/m·k), small thermal expansion coefficient.
Excellent structural flexibility. The alkali salts of K2SO4, Na2SO4, NaCl, and KCl decomposed from cement materials have strong anti-corrosion and anti-penetration capabilities.
High load softening temperature and excellent thermal shock resistance. Suitable for key parts of SP and NSP kilns with high kiln temperature, fast rotation speed, strong alkali corrosion ability, and heavy mechanical load. It can effectively extend the life of the furnace lining and maintain a low kiln shell temperature.

Rongsheng Magnesium Aluminum Spinel Brick for Sale from Manufacturer

Rongsheng Refractory Manufacturer, Magnesium Aluminum Spinel Brick is a refractory material with a high melting point, small thermal expansion coefficient, low thermal conductivity, good thermal shock stability and strong corrosion resistance. Magnesium aluminum spinel brick belongs to isometric crystal system minerals, and high-purity magnesium aluminum spinel brick is colorless. Magnesium aluminum spinel crystals formed under natural conditions have good chemical stability, so they are commonly found in drifting sand deposits. Magnesium aluminum spinel crystals with pure composition do not hydrate or react with acid. Magnesium aluminum spinel bricks are made of light-burned magnesium powder, industrial alumina, or high-quality inkstone clay, and are made after cooperative melting, cooling and crushing. The advantages of magnesium aluminum spinel bricks are good crystal development, large grain size, dense structure, and strong corrosion resistance. To purchase high-quality magnesium aluminum spinel bricks for cement rotary kilns, please contact Rongsheng for free samples and quotations.

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Blog

Sep 5 2024

How Castable Gunmix Does Furnace Patching and Maintenance

In industries that rely heavily on high-temperature operations, such as steel manufacturing, foundries, and cement plants, maintaining the integrity and efficiency of furnaces is crucial. Over time, the intense heat, thermal cycling, and exposure to corrosive materials can cause wear and tear on the furnace linings. To ensure that these furnaces continue to operate efficiently and safely, regular maintenance and patching are essential. One of the most effective solutions for this is the use of Castable Gunmix. In this blog post, we’ll explore how Castable Gunmix is utilized for furnace patching and maintenance, and why it is an indispensable tool for industries dealing with high-temperature processes.

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What is Castable Gunmix?

Castable Gunmix is a type of refractory material specifically designed for repairing and maintaining high-temperature industrial furnaces. Refractories are materials that can withstand extremely high temperatures without degrading. Castable Gunmix is a mix of refractory aggregates, binders, and additives that can be applied using a gunning machine, making it easier to repair worn-out or damaged areas in a furnace lining.

Unlike traditional refractory bricks, which require precise cutting and placement, Castable Gunmix can be applied directly to the affected areas, ensuring a quick and efficient repair process. This method of application not only saves time but also reduces labor costs and minimizes downtime, which is crucial in industries where furnace availability is key to production.

The Role of Castable Gunmix in Furnace Patching

Furnace patching is a vital part of furnace maintenance, as it addresses localized damage that, if left untreated, could lead to more extensive repairs or even complete furnace failure. Castable Gunmix plays a critical role in this process due to its unique properties and application method.

Flexibility in Application: Castable Gunmix can be applied to various furnace linings, including those with complex shapes and hard-to-reach areas. The gunning process allows for precise application, ensuring that the material adheres well to the existing lining and forms a strong bond. This flexibility is particularly important for patching cracks, spalls, and other localized damage that may not warrant a full lining replacement.

High-Temperature Resistance: One of the most important characteristics of Castable Gunmix is its ability to withstand high temperatures. Depending on the specific formulation, Castable Gunmix can resist temperatures well above 1000°C (1832°F). This makes it suitable for use in furnaces operating under extreme conditions, where other materials might fail.

Thermal Shock Resistance: Furnace linings are often subjected to rapid temperature changes, which can cause thermal shock and lead to cracking or spalling. Castable Gunmix is designed to have excellent thermal shock resistance, meaning it can absorb and dissipate the stresses caused by sudden temperature fluctuations. This property helps extend the life of the furnace lining and reduces the frequency of repairs.

Abrasion and Corrosion Resistance: In many industrial processes, furnace linings are exposed to abrasive materials, molten metals, and corrosive gases. Castable Gunmix is formulated to resist these harsh conditions, ensuring that the patched areas remain intact and functional for longer periods. This resistance to abrasion and corrosion is particularly valuable in industries like steelmaking, where furnace linings are constantly under attack from molten slag and other aggressive substances.

Ease of Installation: The gunning process for applying Castable Gunmix is relatively straightforward and can be performed by trained personnel with minimal disruption to the furnace operation. This ease of installation is a significant advantage, as it allows for quick repairs that minimize downtime and keep the furnace running at optimal capacity.

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The Maintenance Benefits of Using Castable Gunmix

Regular maintenance of industrial furnaces is essential to ensure their longevity and efficiency. By incorporating Castable Gunmix into the maintenance routine, industries can reap several benefits:

Extended Furnace Life: By addressing minor damages promptly with Castable Gunmix, industries can prevent small issues from escalating into major problems that require costly repairs or even furnace replacement. Regular patching with Castable Gunmix helps extend the overall life of the furnace lining, reducing the need for frequent and expensive overhauls.

Reduced Downtime: Downtime in industrial operations can be incredibly costly. The quick and efficient application of Castable Gunmix allows for repairs to be completed in a fraction of the time compared to traditional methods. This means that furnaces can be back in operation sooner, minimizing production losses and maximizing efficiency.

Cost-Effective Solution: Castable Gunmix offers a cost-effective solution for furnace maintenance. The material itself is relatively inexpensive, and the gunning process reduces labor costs and the need for extensive preparation. Additionally, the longer lifespan of the repaired linings translates to lower maintenance costs over time.

Improved Safety: A well-maintained furnace is a safer furnace. By using Castable Gunmix to patch and maintain furnace linings, industries can reduce the risk of catastrophic failures that could lead to accidents, equipment damage, or even loss of life. Regular maintenance with Castable Gunmix ensures that the furnace operates safely and reliably.

Importance of Furnace Maintenance

In high-temperature industries, the importance of furnace maintenance cannot be overstated. Castable Gunmix provides an efficient, cost-effective, and reliable solution for patching and maintaining furnace linings. Its unique properties, including high-temperature resistance, thermal shock resistance, and ease of application, make it an indispensable tool for industries that rely on continuous furnace operation.

By incorporating Castable Gunmix into their maintenance routines, industries can extend the life of their furnaces, reduce downtime, lower maintenance costs, and improve overall safety. As the demands on industrial furnaces continue to increase, the role of Castable Gunmix in furnace patching and maintenance will only become more critical. Whether you are in steel manufacturing, cement production, or any other high-temperature industry, investing in regular maintenance with Castable Gunmix is a smart choice that will pay off in the long run.

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Category Archives: Blog

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Low Thermal Conductivity Magnesia-Alumina Spinel Bricks

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Application of Low Thermal Conductivity Magnesia-Alumina Spinel Bricks

Magnesium-Aluminum Spinel Brick for Lime Kiln

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The Use Temperature of Different Grades of Mullite Polylight Bricks

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High Temperature Furnace Mullite Insulation Refractory Brick Factory

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Rongsheng Mullite Insulation Brick

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Why does the Circulating Fluidized Bed Boiler Lining need High-Strength Wear-Resistant Castables?

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Where is the Main Function of Wear-Resistant Castables?

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Features of RS Premium Mullite Bricks

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Why can Mullite Bricks be Used as Thermal Insulation Materials?

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Are Lightweight Mullite Bricks Acid-Resistant?

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Honeycomb Ceramic Catalyst Carrier

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Characteristics of Honeycomb Ceramic Catalyst Carrier

Application of Cordierite Ceramics

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Refractory materials

Catalyst carrier

Microwave communication dielectric materials

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Material Properties of Magnesia-Alumina Spinel

Magnesia-Rich Magnesia-Alumina Spinel

Dense Magnesium Aluminate Spinel

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How do you Identify High-Quality Cordierite Baked Slabs?

Differences in raw material quality and mix ratio

Raw material processing process

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Firing temperature and firing time

Subsequent grinding and packaging

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7-Hole, 19-Hole, 31-Hole and 37-Hole Hot Blast Furnace Checker Bricks

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The Volume Stability of the Hot Blast Furnace Checker Brick is Good

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Production of Magnesium Aluminum Spinel Bricks

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Performance Advantages of Spinel Bricks

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Application of Rongsheng Magnesium Aluminum Spinel Brick in the Transition Zone of Cement Rotary Kiln

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Product Characteristics of Rongsheng Magnesium Aluminum Spinel Bricks

Rongsheng Magnesium Aluminum Spinel Brick for Sale from Manufacturer

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What is Castable Gunmix?

The Role of Castable Gunmix in Furnace Patching

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The Maintenance Benefits of Using Castable Gunmix

Importance of Furnace Maintenance

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